应用程序在摄像头崩溃后的动作
应用程序在摄像头崩溃后的动作
提问于 2016-04-27 18:15:02
在一张图片被捕获后，我想要改变片段，但是应用程序只会崩溃。“守则”的重要和部分在最后。谢谢你的提示或解决方案。因为我是Java(android)开发的新手，我不知道我的错在哪里。
这是我的密码：
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
import android.widget.Toast;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
NavigationView navigationView = null;
Toolbar toolbar = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
main newFragment = new main();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, newFragment);
transaction.addToBackStack(null);
transaction.commit();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setImageResource(R.drawable.ic_menu_camera_light);
int color = Color.parseColor("#FFFFFF");
fab.setColorFilter(color);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
takePhoto();
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
// super.onBackPressed();
}
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.nav_camera) {
main newFragment = new main();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, newFragment);
transaction.addToBackStack(null);
transaction.commit();
} else if (id == R.id.nav_gallery) {
/*noVIP TextFragment = new noVIP();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, TextFragment);
transaction.addToBackStack(null);
transaction.commit();*/
select_type TextFragment = new select_type();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, TextFragment);
transaction.addToBackStack(null);
transaction.commit();
} else if (id == R.id.nav_manage) {
Toast.makeText(MainActivity.this, "Nur Style ;)", Toast.LENGTH_SHORT).show();
} else if (id == R.id.nav_share) {
Toast.makeText(MainActivity.this, "Nur Style ;)", Toast.LENGTH_SHORT).show();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
private static final int TAKE_PHOTO_CODE = 1;
private void takePhoto() {
final Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(getTempFile(this)));
startActivityForResult(intent, TAKE_PHOTO_CODE);
}
private File getTempFile(Context context) {
final File path = new File(Environment.getExternalStorageDirectory(), context.getPackageName());
if (!path.exists()) {
path.mkdir();
}
return new File(path, "image.tmp");
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
switch (requestCode) {
case TAKE_PHOTO_CODE:
final File file = getTempFile(this);
try {
Bitmap captureBmp = MediaStore.Images.Media.getBitmap(getContentResolver(), Uri.fromFile(file));
HaveTakePhoto(); //Call the Fragment Change.
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
break;
}
}
}
void HaveTakePhoto() { //<--- Called after the Picture has taken.
noVIP TextFragment = new noVIP();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, TextFragment);
transaction.addToBackStack(null);
transaction.commit();
//Toast.makeText(MainActivity.this, "Do Stuff", Toast.LENGTH_SHORT).show();
}
}坠机报告：
04-27 20:27:20.774 26944-26944/android.niklasvlach.simplegerman E/AndroidRuntime: FATAL EXCEPTION: main
Process: android.niklasvlach.simplegerman, PID: 26944
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {android.niklasvlach.simplegerman/android.niklasvlach.simplegerman.MainActivity}: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.app.ActivityThread.deliverResults(ActivityThread.java:3607)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3650)
at android.app.ActivityThread.access$1400(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1370)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5294)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
Caused by: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1493)
at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1511)
at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:638)
at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:617)
at android.niklasvlach.simplegerman.MainActivity.HaveTakePhoto(MainActivity.java:165)
at android.niklasvlach.simplegerman.MainActivity.onActivityResult(MainActivity.java:148)
at android.app.Activity.dispatchActivityResult(Activity.java:6192)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3603)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3650)
at android.app.ActivityThread.access$1400(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1370)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5294)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699) noVIP片段：
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* A simple {@link Fragment} subclass.
*/
public class noVIP extends Fragment {
public noVIP() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_no_vi, container, false);
}
}PS:如果我每隔一次都用这个代码来修改这个片段，应用程序就不会崩溃。
回答 1
Stack Overflow用户
回答已采纳
发布于 2016-04-27 18:54:28
调用commitAllowingStateLoss()与其说是修复，不如说是黑客。国家损失很严重，应不惜一切代价加以避免。在调用onActivityResult()时，活动/片段的状态可能尚未恢复，因此在此期间发生的任何事务都将因此丢失。这是一个非常重要的错误，必须加以解决！(请注意，只有当您的活动在被系统杀死后才会发生.这取决于设备有多少内存，有时会很少见.因此，这种错误并不是很容易在测试时捕捉到的)。
尝试将事务移动到onPostResume()中(注意，onPostResume()总是在onResume()之后调用，而onResume()总是在onActivityResult()之后调用)：
private boolean mReturningWithResult = false;
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
mReturningWithResult = true;
}
@Override
protected void onPostResume() {
super.onPostResume();
if (mReturningWithResult) {
// Commit your transactions here.
}
// Reset the boolean flag back to false for next time.
mReturningWithResult = false;
}欲了解更多细节，请访问碎片交易和活动状态损失
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/36897783
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